Volume 84, Number 2, October 2008
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||02 October 2008|
Unconventional critical behavior in the weak ferromagnet BaIrO3
KYOKUGEN, Osaka University - 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
2 Low Temperature Center, Osaka University - 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
3 Department of Applied Physics, Waseda University - 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
4 CREST, Japan Science and Technology Agency - Kawaguchi, Saitama 332-0012, Japan
Corresponding author: email@example.com
Accepted: 4 September 2008
We report the results of ac/dc magnetization study of the critical behavior in a weak ferromagnet BaIrO3. The critical temperature has been determined to be = 182.8 K by the ac susceptibility measurement. We have analyzed our dc magnetization data near with the help of the modified Arrott plot method. The critical exponents have been determined to be = 0.82±0.03, γ = 1.03±0.03, and δ = 2.20±0.01, which roughly obeys . Using these values of , , and γ, we find that each magnetization-field-temperature (M-H-T) behavior below and above obeys a scaling relation, following a single equation of state in which is uniquely related to where . These findings demonstrate that the ferromagnetic transition in BaIrO3 belongs to a new universality class of the second-order phase transition.
PACS: 75.40 Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.60.Ej – Magnetization curves, hysteresis, Barkhausen and related effects / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EPLA, 2008
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